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LEROY-SOMER
4 - COMMISSIONING
The commissioning principle is the same regardless of the
type of excitation.
4.1 - for standalone regulation
- Check fuses F1 and F2 which are situated on terminal block
C in the alternator.
- Check the regulator:
- Check the position of the ST3 jumper (select the frequency,
50 or 60Hz).
- If an external voltage potentiometer is being used,
disconnect it from the regulator and install the ST4 jumper
(regulator terminal block J2) or the ST10 jumper (terminal
block C) in the alternator terminal box.
- Turn the internal voltage potentiometer P2 on the regulator
fully anti-clockwise.
- Set the alternator to its rated speed using the drive system.
- The alternator voltage should rise to a value of 85 to 90%Un.
- Adjust the voltage to the required value using potentiometer
P2.
- Turn potentiometer P1 fully anti-clockwise.
- Perform an on-load test with power factor = 0.8 or power
factor = 1. The voltage should remain constant within the
limits of the regulator. If it is not stable, see section 13-9.
- Stop the alternator and reconnect the external
potentiometer, setting it to the centre position.
- Set the alternator to its rated speed then, using the external
potentiometer, set the alternator to its rated voltage.
- The regulator set-up phase is now complete.
4.2 - for 1F regulation (parallel
operation between alternators)
- The previous settings should be made on each alternator.
- Set the droop potentiometer to the centre position and
perform an on-load test.
- With a load at power factor = 1, the voltage does not drop or
only drops slightly; with an inductive load, the voltage drops.
This voltage dip is set using the droop potentiometer P1. The
no-load voltage is always higher than the on-load voltage; if
the voltage rises, invert the parallel operation CT. The voltage
quadrature droop is generally 2 to 3% of the rated voltage.
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
C
OMMISSIONING
- The no-load voltages should be identical on all the
alternators intended to run in parallel.
- Connect the alternators in parallel at no load.
- By adjusting the voltage setting P2 or the external voltage
potentiometer on one of the machines, try to eliminate (or
minimise) the circulating stator current between the
machines.
From now on, do not touch the voltage settings.
- Match the kW rating with a minimum of 30% of the load by
adjusting the drive system speed.
- By adjusting the droop potentiometer P1 on one of the
machines, match or divide the stator currents.
- If several alternators are running in parallel, take one as a
reference.
4.3 - for 2F regulation (regulation of
power factor and 3F regulation
(voltage match circuit)
manual ref. 2440)
- Check the wiring between the R 452 and the R 726. (See the
connection diagram).
- Check the information given for the R 726: Mains voltage, 2F
contact, 3F contact.
- If an external voltage potentiometer is being used,
disconnect it from the R 726 and add the ST1 jumper
(terminals 3 and 4 of J1) or disconnect it from terminals 25
and 26 of terminal block C of the alternator and add the ST10
jumper.
- If an external PF potentiometer is being used, disconnect it
from the R 726 and add the ST2 jumper (terminals 9 and 10
of J1) or disconnect it from terminals 29 and 30 of terminal
block C of the alternator and add the ST11 jumper.
- Perform a 1F test.
The test principle is the same as in the case of 1F regulation.
- Matching the alternator and mains voltages prior to
synchronisation (3F):
If this function is not used, match the voltages by adjusting the
voltage potentiometer.
The following settings are for the R 726.
Close the 3F contact (terminals 5 and 6 of J1 of the R 726 or
terminals 34 and 35 of terminal block C of the alternator). The
red LED lights up. Adjust potentiometer P1 to match the
alternator voltage to the mains voltage.
Ref. 3563 GB - 4.33 / a - 01.02
(consult R726
17
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